Write-once optical data storage medium having dual recording...

Dynamic information storage or retrieval – Storage medium structure – Optical track structure

Reexamination Certificate

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Reexamination Certificate

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07573802

ABSTRACT:
A dual-stack optical data storage medium for write-once recording using a focused radiation beam entering through an entrance face of the medium is described. The medium includes at least one substrate with present on a side thereof a first recording stack L0having a write-once type L0recording layer with an absorption kL0and a second recording stack L1including a write-once type L1recording layer with an absorption kL1. The first recording stack L0has an optical reflection value RL0and an optical transmission value TL0and the second recording stack has an optical reflection value RL1. The first recording stack is present at a position closer to the entrance face than the second recording stacks When the following conditions are fulfilled: 0.45 ≦TL0≦0.75 and 0.40 ≦RL1≦0.80 and kL0<0.3 and kL1<0.3 a dual stack write-once medium is achieved which can be played in a standard DVD-ROM player.

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